Print Armstrong Numbers Between Two Numbers in Java

An Armstrong number is a number which equals to the sum of the cubes of its individual digits. For example, 153 is an Armstrong number as −

153 = (1)3 + (5)3 + (3)3
153 1 + 125 + 27
154 153

Algorithm

1. Take integer variable Arms.
2. Assign a value to the variable.
3. Split all digits of Arms.
4. Find cube-value of each digit.
5. Add all cube-values together.
6. Save the output to Sum variable.
7. If Sum equals to Arms print Armstrong Number.
8. If Sum does not equal to Arms print Not Armstrong Number.

Example

Below is an example to print the Armstrong numbers between two numbers in Java:

import java.util.Scanner;
public class ArmstrongBetweenTwoNumbers {
   public static void main(String args[]){
      int num1, num2;
      Scanner sc = new Scanner(System.in);
      System.out.println("Enter the first number ::");
      num1 = sc.nextInt();
      System.out.println("Enter the second number ::");
      num2 = sc.nextInt();

      for (int i = num1; i<num2; i++){
         int check, rem, sum = 0;
         check = i;
         while(check != 0) {
            rem = check % 10;
            sum = sum + (rem * rem * rem);
            check = check / 10;
         }
         if(sum == i){
            System.out.println(""+i+" is an Armstrong number.");
         }
      }
   }
}

Output

Enter the first number::
1
Enter the second number::
500
1 is an Armstrong number.
153 is an Armstrong number.
370 is an Armstrong number.
371 is an Armstrong number.
407 is an Armstrong number.